Telephone substation apparatus



April 13, 1937. L. M. HARLOW ET AL 2,076,637

TELEPHONE SUBSTAT ION APPARATUS Filed April 25, 1935 CENTRAL OFF/CE M/VEN CMMAPES er &

A TTORNEV Patented Apr. I937 UNITED STATES PATENT OFFICE TELEPHONE SUBSTATION APPARATUS Leonard M. Harlow, Glenbrook, Conn., and

Charles M. Mapes, Hackensack, N. J., assignors to American Telephone and Telegraph Company, a. corporation of New York Application April 25, 1935, Serial No. 18,244

Claims. (01. 179-164) This invention relates to telephone substation the dialing mechanism embodied in the desk stand apparatus, and more particularly to hand teleshown in Fig. 1; phone mountings for automatic systems. Fig. 3 is a detail view showing the association One object of this invention is to simplify the of the circuit controlling members in the dialing 5 structure, and thereby to reduce the manufacmechanism and an actuating rod therefor;

turing and maintenance cost of mountings for Fig.4 is a diagrammatic view showing the elechand telephones. trical association of the receiver and transmitter In one illustrative embodiment of this invention, of the hand telephone and elements of substation a mounting for hand telephones comprises a desk apparatus with the circuit controlling members stand having a cradle for accommodating the in the dialing mechanism.

hand l p a reciprocable plun r h vin a Referring now to the drawing, the telephone portion disposed in the Cradle, and a dialing desk set illustrated comprises a desk stand, which mechanism. The dialing mechanism may be of may be of the general structure disclosed in the general design disclosed in Patent No. 1,161,854 Patent 1,508,424, granted September 16, 1924, to

granted November 30, 1915 to Oscar F. Forsberg, George K. Thompson, including abase l0 having a l5 and includes a plurality of Contact e s, cersloping front wall II, a pedestal I2, and a cradle tain of which are associated with the receiver and portion having tines l3 and adapted to receive the transmitter of the hand telephone, and one of handle [4 of a hand telephone. The hand telewhich is adapted to be actuated by operation of phone, as indicated in Fig. 4, may include a rem the dialing mechanism to produce a desired numceiver [5 at one end of the handle 14 and a transber of impulses in the circuit connecting the submitter l6 at the other end of the handle, the station with a central olfice. transmitter having a condenser 45 in shunt there- In accordance with a feature of this invention, with. The desk stand includes also a reciprocal means are provided for actuating the one contact plunger having an arm 16 disposed in the cradle when the hand telephone is removed from or and a spindle H extending through the pedestal 25 placed in the cradle whereby the subscribers stal2 and within the base Ill. The plunger is adapted tion at which the mounting is situated will be conto be depressed against the action of a spring l8 nected or disconnected, respectively, with the line when the hand telephone is placed in the cradle toa central oiiice. More specifically, a mechaniand, conversely, is adapted to be raised by the 3g cal coupling is provided between the plunger and spring 18 when the hand telephone is removed this one contact whereby the contact will be closed from the cradle.

when the hand telephone is removed from the Mounted upon the sloping wall H of the base In cradle and will be opened when the hand teleis a dialing mechanism l9, which may be of the P110118 is placed in the cradle. general construction disclosed in Patent 1,161,854,

This construction obviates the use of the usual granted November 30, 1915 to Oscar F. Forsberg, 35 circuit COnt o members separate from the and which includes afinger Wheel 20. The dialing contacts on the dialing mechanism and thereby mechanism, as Shown more clearly in Fig 2 nsimplifies the structure of mountings for telen d governor 2|, and a plurality of rigid i phones and substation circuits associated there- Quit controlling or contact members 25 and 21 with. Furthermore, it eliminates maintenance of nd leaf spring contact members 22, 23, 24 and 2m 40 contacts separate from the dialing mechanism A h wn in Figs, 2 and 4, the contact springs 23 and enables the use Of a single assembly Of 6011- and 24 are mechanically coupled by an insulating tacts in a var ety of Sy tems req ing d nt spacer 28 and the contact member 25 and contact contact arrangements. spring 26 are electrically connected. As shown 45 The invention and the features thereof will be in Fig. 2, the contact spring 26 is extended and understood more clearly and fully from the foladapted to be engaged by an actuating member lowing detailed description with reference to the 29 pivotally supported on a bracket 30. The accompanying drawing, in which actuating member 29 is reciprocable in accordance Figure 1 is a side ele ation l ie partly i with the characters and digits of the exchange and cross-section, of a telephone desk set includin a, number dialed so that as described hereinafter desk stand constructed in accordance with this the circuit controlled by the contact members 26 invention, and a hand telephone shown partly in and 21 is interrupted a coresponding number of cross-section resting thereon; times and the requisite number of impulses is Fig. 2 is a plan view, partly in cross-section, of produced in the circuit. 55

The outer parts of the dialing mechanism within the base It! may be enclosed within a dust-proof cover 3! which carries a guide bracket 32 and has a guide aperture in one wall thereof. A push rod 33 of insulating material extends slidably through the bracket 32 and the guide aperture and, as shown clearly in Fig. 3, is provided with depending lugs 34 for engaging the spring contacts 22 and 26. The rod 33 is engaged by a bowed l spring 35 which is suitably secured, as by rivets 38, to the cover 3% and tends to move the springs 22 and 23 into engagement with the circuit controlling members 23 and 27, respectively. The outer or projecting end 3'! of the push rod 33 is engaged, as shown clearly in Fig. 1, by a tapered tip 38 threaded upon the spindle l1 and locked thereto by a screw 39 threaded into the spindle. The tip 38 may be moved relative to the spindle I! and the travel of the push rod thereby adjusted.

As illustrated diagrammatically in Fig. 4, a desk stand in accordance with this invention, may be associated with the usual substation apparatus, such as a condenser 48, a ringer 4! and an induction coil having windings 48 and 49. The winding i8 is connected to the contact member 24 by a conductor 56 and to one of the line conductors it to the central office and the other winding i9 is connected to the contact member 23 by conductor 52. The other line conductor 53 is connected to the contact member 21.

When the hand telephone is in the cradle of the desk stand, the plunger I6, I! is depressed and the push rod 33 holds the contact springs 22 and 35 26 away from the contact members 23 and 27, re-

spectively, so that the hand telephone and the dialing mechanism are disconnected from the lines 5! and 52 to the central office. When the hand telephone is removed from the cradle, the

plunger rises under the action of the spring IS, the tip 38 slides along the projecting end 31 of the push rod and the push rod moves outwardly, e. g., to the right in Fig. 4-, so that the spring contacts 22 and 2B engage the contact members 23 and 22', respectively. Thus, the transmitter I6 is connected in circuit with the lines to the central office through a path including conductor 53, contact member 21, spring contact 25, transmitter i6, and conductor 56 and the receiver i5 is connected in circuit with the lines to the central ofiice through a path including conductor 5i, winding -18, receiver 55, contact member 22, contact spring 23, conductor 52, winding l9, condenser 43 and conductor 53.

When the dialing mechanism is operated a number of impulses, corresponding to the characters and digits of the exchange and number dialed, are produced in the lines to the central office through a circuit including conductor 53,

contact member 2?, spring contact 26, contact member 25, spring contact 24, conductor 50, winding Q3 and conductor 5|. This circuit is interrupted by the pivotaliy supported member 29 which engages the spring contact 26 and moves it 5 away from the contact member 21 to produce the requisite number of impulses. During the dialing operation, the receiver circuit is broken by a member, not shown, on the dialing mechanism which moves the spring contact 23 away from the spring 7 contact 22 and also moves the spring contact 24 into engagement with the contact member 25.

Replacement of the hand telephone upon the cradle causes inward movement, e. g., movement to the left in Fig. 4, of the push rod 33 so that the 75 engagement between contact springs 22 and 23 and between contact spring 25 and contact member 21 is broken and the hand telephone and dialing mechanism are thereby disconnected from the line conductors 5i and 53.

Although the desk stand has been described hereinabove as utilized in substation apparatus having a sidetone circuit, it will be understood, of course, that it may be utilized also in such ap paratus having an anti-sidetone circuit.

This construction, it will be apparent, obviates the use of the usual contact assembly separate from the dialing mechanism and thereby simplifies the structure of telephone substation apparatus. Furthermore, it renders all the contacts readily accessible by removal of the base plate .5 of the desk stand and thereby expedites repair of the desk stand and reduces the maintenance cost thereof.

An insulating block i! is mounted upon the dialing unit and is provided with terminal screws or lugs 42 which project through the cover 3|. Screws or lugs may be electrically connected to the contact members by a cord, not shown, and may be connected to other parts of the substation apparatus by another cord, not shown.

Although a specific embodiment of the invention has been shown and described, it will be understood, of course, that modifications may be made therein without departing from the scope and spirit of this invention as defined in the appended claims. It will be understood also that although the invention has been described with ref erence to desk sets including hand telephones, it may be embodied equally well in wall sets and in desk sets of the type having a transmitter mounted on a standard and a hook for accommodating a receiver, the hook actuating a plunger akin to the plunger 16, H.

What is claimed is:

l. A mounting for a hand telephone, comprising a support having a cradle for accommodating the hand telephone, a unitary assembly carried by said mounting and including a dialing mechanism and a circuit controlling member mounted on and actuable by operation of said dialing mechanism, a reciprocable plunger having a portion in said cradle and adapted to be engaged by said hand telephone, and means mechanically coupling said plunger with said circuit controlling member.

2. A mounting for a hand telephone comprising a support having a portion for accommodating said telephone, a reciprocable plunger extending into said portion, dialing mechanism mounted on said support, a circuit controlling member mounted on and actuable by said dialing mechanism, and a push rod adapted to engage said member and actuable by said plunger.

3. A mounting for a, hand telephone including a receiver and a transmitter, said mounting comprising a cradle for receiving said hand telephone, a plunger having a portion within said cradle, a dialing mechanism, contact members mounted on said dialing mechanism, one of said contact members being actuable by said mechanism and in circuit with said transmitter, another of said contact members being in circuit with said receiver, and a push rod engaging said contact members and operable by said plunger to actuate said contact members when said hand telephone is placed upon and removed from said cradle.

4. A telephone set comprising a mounting having a portion for accommodating a telephone instrument, a plunger reciprocable in accordance with the placement of said instrument upon said portion and removal thereof from said portion, a dialing mechanism having a portion within said mounting, a circuit controlling member on said second portion and actuable by said dialing mechanism, a cover for said portion of said dialing mechanism, and a push rod carried by said cover and extending therefrom, said push rod being adapted to engage said circuit controlling member and said plunger whereby said member is actuated in accordance with the placement of said telephone instrument upon said mounting or removal thereof from said mounting.

5. A mounting for a hand telephone including a transmitter and a receiver, comprising a hollow base and a cradle for accommodating the hand telephone, a reciprocable plunger having a portion in said cradle and a portion within said base, a dialing mechanism having a portion within said base, a plurality of line contact springs mounted on said mechanism, one of said contact springs being in circuit with said receiver and another of said contact springs being in circuit with said transmitter and actuable by said dialing mechanism, a removable cover enclosing said portion of said dialing mechanism and said contact springs, a push rod slidably mounted within said cover and carried thereby, said push rod engaging said contact springs and adapted to be actuated by said second portion of said plunger to open the circuits in which said springs are included, and a spring member mounted in said cover and coupled to said push rod for urging said push rod in a direction such as to actuate said contact springs to close the circuits in which they are included.

LEONARD M. HARLOW. CHARLES M. MAPES. 

